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An index is a database object with its own storage that provides a fast access path into a collection. Indexes exist primarily to enhance performance, so understanding and using indexes effectively is of paramount importance when optimizing MongoDB performance.
B-Tree Indexes
The B-tree (“balanced tree”) index is MongoDB’s default index structure. Figure 5-1 shows a high-level overview of the B-tree index structure.
Figure 5-1
B-tree index structure
The B-tree index has a hierarchical tree structure. At the top of the ...
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